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Swollen Optic Disk: blurring of optic disc margins and engorgement of vessels. Severe swelling causes obliteration of disc anatomy and hemorrhages around disc.
Papilledema = increased ICP + swelling
Papillitis = optic nerve inflammation + swelling
**Swollen Optic Disk localizes to the optic nerve, which is surrounded by meninges that transmit the increased intracranial pressure to the disc**